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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7bb3c7e84980cb6210e4519bf4ba6be1491d21e0078e496ddd395c8ebf47b00' 
  AND token = 'Sb1SRGtB1PDCyi5/ZSWl3Ke8p9z2CFCwUChV1gdcEWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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