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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537987dbc6708d83913e802f4f054e871039b5139e274122ee9a1660db0b2227' 
  AND token = 'y6et1+EqOPXEil+Jl1+ic9Kail8Wg+0KMr1gnIJTg1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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