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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5026a38a8c2410fe844c408163dc857b039d87e22e31ea68cbd749f427b90793' 
  AND token = 'At3jZOttuKMTYEf0f9YWBbWf4Z4YIuGWMhK7bXGDZ+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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