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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d191106d5ea2b27d5f95e5aad7866ae3cf7c689fb2948b029bb2467fbe7214c' 
  AND token = 'Q2OMlQtc2epwkO6RMJ/kukcwNcT6EVPwocZldYiLcXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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