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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8112ffefcce96f544068db3786a03eb775f00c27e0d2108c99dd22530d97d71' 
  AND token = 'ARto6iRp587zbGg9BnQNC+aBvs9aYOFbdJ7CijgpMB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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