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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98d7a53a676b2c50f41a41ca912cf608c959a8564c728012aa30ef237cd5ff1' 
  AND token = 'W+zI6G1PkMzEJYectgrhagV4okLsKsuLUav65djOREc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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