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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3628afe92b1276803126bdfdff094839ad6da30dd2c8364cd6c821d3a87a44f3' 
  AND token = 'gibvbfulJ+QLg6c6e79+dBicO1KevSu9rmGa+Ozi64Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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