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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3a0e5733ac17a1c20fd9597bde4f9ab4146e81c50116abdeb885dfeee49d53' 
  AND token = '69UhhA136Y+NizaoBn2t2ikNlnYVhABlqyjH7cP2BFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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