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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a1566a956e50ef8ba630f8fc81222a32bf45dc030b0b4da56f0ff24b54e73c' 
  AND token = 'XEKPz25tAa9yHC6JvR0gAZX3FiTO1sQOrlCOXdKCgf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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