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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f2afe566fface89d721f024d45b2ac59d59842ed76a7ff580f81351bbd10b5' 
  AND token = 'KIRyyIg3NZ+OhI4hP44GfyBk53+NvIraf7iy+65/Rfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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