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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7863fd65e128199dc1c07c62d130291beb525bb42465733464f58f7facfc0f01' 
  AND token = 'YbzTD0vtz1Hrio4hFOmnd04GtHkVPrK5gmKG0lsPxfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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