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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c82b7eff94461bcab233ac58a958ce661833d20cb6ad55e6b66e2a78c04aa9e' 
  AND token = 'O3oiQxmFHf1y0s2znqbJM0z0eb+Lm2jy905sR2FqANQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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