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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e235c3d35e63c92b95fb1f8ff352522b627174c21730af480103181b991239' 
  AND token = '2yFNpzzCfG8JIbyJb5FblCDo2iFak+qkDPisVTz1irQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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