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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9605d1c186000c428ccdd0b75228ddc4b9b128f3a1c06b9ab494d8ead96a17c1' 
  AND token = 'zgLLCUW7Gj9jL3j8cl0gEaJJyGXThBSRYDQoSkUIWro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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