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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a72e8765c191253ee203b35354d265243410bff7d1e02fb3d511e619f8d010' 
  AND token = '5ZpZ6zyz1HaK/YmI8ZS/FpuYQ/QIXin3H3KyzT6uwGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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