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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e27f68295a9cc74c5568b489ef7505448940c06929b4f53dcf46ea95bb92535' 
  AND token = '7Kzt05fVJgO8II8evCXdQB5z9u4nZdNn2avlsI80DQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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