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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3410b21b92eea0f0baa4976f6089261122d3b1289200b6d1e1b506eb0d4a3f23' 
  AND token = 'KZmuOOfc4CX3mBH0j+3zNq8ThFDyrM6YGZuLrRDlp9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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