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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b434c7208a311a2686f8069c1593dfee1649645d69b91b4583551313c415c8' 
  AND token = 'oXrj7MTF89sd2NPsWQTg4xUju/qlEPqPpPfDG3ZB6C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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