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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8edaba15bd35421ffeef7ca95ff6e0eb7756e47621b763cbec3c68a987a8ce8' 
  AND token = 'FeV7jin8Cp1YP2MESt6+1OZ58FHEymZdALO3OfZqZ/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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