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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1902d82b1ed759e8b9ee03c07d15951a5b9cb778469c078a0ba18022da781e47' 
  AND token = 'FJ1p1o172L4JXAGZ0b/N5PEwZTc2Qs/5vl8tZfJpxng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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