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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02c6897c9d42fe160c88c67ce51efe81e701ea5133ff1a56c06e174066d88d6' 
  AND token = 'N31zkz++sXO1z6gozZep7oVAGG+64pGMs2mgHnG9rEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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