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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372e44697459eb235d213294a6c810ee183f5f4390b89c7ed2ab98778cac1470' 
  AND token = 'O9sNua9s1jAxCi8QP8eRFyOJub4V6uxbxTHRn6KHICM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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