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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068c75f871a4bb7c977a47c00407bcbfde901bfd680543c8e8a0edbe2ead471f' 
  AND token = 'mKiZdIC5Etkvw271ziLcY7LoT2iiqw5hNq2ueD2BFSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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