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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd51e84c01a58dfefacbbe6173faa1e470f1d3ecbca11b72515af1276e457ac0' 
  AND token = 'agivOtz60pIR0opcjoRfxlacKNOkirBo4GpOfweaEcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}