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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cfb0db422afc42786cd264f7fecb13ed698efeab6d4297bb65ad2b18f040005' 
  AND token = 'zz3HOuNV4JNYnSoWcB6vm4yu7EsY+Yac2LDpKXJcsVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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