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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37655c4f30145fbb229d65a1f19c4c6d8aac0aa5f36ff027dea86a7b28887aa' 
  AND token = 'uMOaAu8Lw4Se5pFv8T2rFxBk0OqI7gL1vXzXrAHlt8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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