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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'def07f8a67094ea20a331dabc5a51594ed1d10c5a264b2008cc521af6ee672d4' 
  AND token = '6TG5ZKe06FgnChVhoEqutcv3D7QAVkR8Qw8Lqzx+MT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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