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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74359c78f3ae28a3a2dfb93e55bf72d81693fb9f915b2400c14ad64806a87614' 
  AND token = 'uZV4iMMjWkeGWLoZLLXWg9jsqREUf0zek1yI4Upkg6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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