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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2f9476c2fdaca9d6428fed9f2ca8b2bd4ee88ae7899f1368d0e40ba254c20c' 
  AND token = '2MEfgRLtk19G4nBfqJVaPBhoZMHmTRd3Kn0OZunQgLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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