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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c762c1698b5ffb7a7a235210eafb02c015172babcdf143bcf0f4b423710781d1' 
  AND token = 'nsa2/OXmtybpQyLe/IaUvsKkVF9m7XxNg/psChUNfco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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