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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bf07e4b3f5713d27be88389458e4208ec2b3225262c5cd56597ff0ad4ba59b' 
  AND token = '78oeo65pQKtQ/r+E25X5HZIRmQ0e+XBx48pX7L/9Jaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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