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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d71fde7c27b6fe2d72c7697efcbab8e42bf100f98554d390bafc7e4f4136af7' 
  AND token = 'rNECW7wvtfe0Ww1/AJ/JvPBfG5X6ElhIzev3q36RDYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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