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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c3a01a261194c88fb920d51b3fa09fcd971365e4d8f7c3fb8c9baf4fd61d68' 
  AND token = '63qkKeUf+bKEpolv1ImkyKSOK45S+Imyw9TQ2t6VFE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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