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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92dd233e51efb874a55aabb49d590b0c08c6b7439ec384664f233a4ea7ac9cc4' 
  AND token = 'ErxYXzT1Lermf/yOMkCcyFpn6KaZvaqJtIJkOeJwyjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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