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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0e5945c253aaf37617c8504e6ce2e8f3b07f8c99fea12e23a66fc9ce341f84' 
  AND token = 'o6cDxRrAT98W/lpru3NLzL1PPI/5jCo+DBApjBXM0yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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