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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392c3c212bbe606f7390e19d259385a071be9471b03e1d9ad684aa3b4aa9120b' 
  AND token = 'xiVDBVVnNSSAjeD3GDFHw2uvM+sEn5LlZFD3m26ZBwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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