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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecaf498985f7ffdf6bc2789ff0b5b7c877a9d3249d492bf47492232971db892c' 
  AND token = 'hoADi2rl1WOl/Mu4XZbpX/orId2nyMkXouAgJ0qgnNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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