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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6318ea4332ca65d32d10bdb4d89f6b8d9cb15e866149c9fdb369dc99cb6791b1' 
  AND token = 'vGbDSPTKAZqzTH8olAZFzll0hv7gdWcY34EYnSVZfBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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