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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e973af44148ae0fd1374db9896c3a1d22573be0cd808696333f3ab48371bfa3d' 
  AND token = '5snVHtADjFJHZfMht3JFkSUKL9nN2H4/FDqhU3e7zRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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