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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f4043c965d54a18145b4c53a30a623f030538a8f2c87eae27c6ced1ef4e474' 
  AND token = 'C8V3SgqzzM/Hr9XcLCLQkDk6+wuOD+jWzvdt5L+pweQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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