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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4464d1bb2f9ce9cc98c36d5bda7f07b5ad281662d58d2799612ee7c5184e7ae' 
  AND token = 'VMFXK8NjDe/Nkftcd6NIutiRI+6WBXcMrSjbYuc54/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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