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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6221b912aa4941b4be83c601d65c9e32c4e2879353f0452d9dd67919dac4ce1' 
  AND token = 'QgVdwKrVscElAiPNdB8tA9J7ZGxp7L1fcfrIuCmqZJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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