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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeab9aaffe8ac090782bfb8e3933dd32e0ed044bed24f5f61df2f907cb9e2520' 
  AND token = '5Kiku1o2PJJIRha0e0Wj4aIZsjlUNJGuB0lS9cvJ9aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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