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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb48fe8268fac2bc3e2b64086d8cc77e7d73d92d613336b771c24ba2231da300' 
  AND token = 'sM0RdYJexivdJb4y9LUXopTEH+Yipb2Bv68FZNeaN5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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