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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a79870ec41d424d7df0413a761e6e39a4ede640edbd5402b6aadf7ebced2f4d' 
  AND token = '+Tgm9n408YHcLhJ/WL164T3eSJEghRkhEDVOf6QfEr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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