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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e3d2bb06273cc7f242496dff71fa3897a8b92ae56709967b60cea0caad7641' 
  AND token = '/dHCfytgDk1ZmuZj7hHkb/BcJ47XP3hbsalj1kPWNa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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