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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ea18435d95d7ec7d1b6aa099b260777ca996c1e31c892812113874d5d569db' 
  AND token = 'I5mZY+ns/Bgyl/Y9cQjeNoW8a3I/756x0k1JD1GLeRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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