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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315b469589fc793fd6d74d099a71533c2c706adc9130d097934551a5a1e001f1' 
  AND token = 'TmkklJ5J9IcFp3y1QuGoLA0E47D/K+C77l/iOMCcBqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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