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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1090fb8d8950ce429d44ed0989621cbe2d79a312e757632a554089f366d936fa' 
  AND token = 'gYL8rBenGv01xUDIVbgyol+1at5gI/OOwYurWV+EvD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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