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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfafbe65e85ba93924ea259c06b4f48cde12311eed70bc82ff632fdc59ab284d' 
  AND token = 'gJ5wKvGbzwxzTdY2qamBocYMqRLFOiUectDAdKfH3X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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