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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8db69d2a0636c2de3ee717ec4f89dccdaca3b752c7741ef61a0ec987c89eb61' 
  AND token = 'VmS6N6jValsMZ3u2CPXt6Cm/ulpGyARsNTkq/W3apC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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