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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546c7af5e1fabbec2307d68bc22f7c0ed33e880a71a4e4d955160b2bb9b23ecb' 
  AND token = 'EXf15zPQcmrew54/JS051avsKdFVrgi7J9dJB1GO4MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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