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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed13586fbd74ed45ee5da3af12c8c2178ff2b1a789335373894f2859cdc93a9' 
  AND token = '4HWGU4+ehG4CnLRXRlTcmJwL16H9b673U+0oSXEOTmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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