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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf44fd4e25fb01188a31a5e2f53bf82dea038efb7d403b3aaa1be77fd8ac4aa' 
  AND token = 'Eaz30/P5BCC5VuQEN3TyP9nK/9x9ay2t/8bUwqJgOig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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